Update dps enrollment to accept certificate for various file extension

Elsie4ever commented 1 year ago

This is to improve the user experience when creating/update dps enrollment, user should be able to upload certificate in various file extension. However I added a content validator before the service call is made. Now the validator will throw exception when any of these conditions fail:

start with -----BEGIN CERTIFICATE----- (prefix)
end with -----END CERTIFICATE----- (suffix)
content should be valid base64 string without prefix and suffix

ran related unit test and all passed

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